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UNITED STATES PATENT i Orr-TUE.

JOHN W. MCGILL, OF NEW YORK, N.

IMPROVEMENT IN POCKET gter L-KNIVES.

Spcciication forming part of Letters Patent No. 209,411, dated October 29,A 1878 application filed April 2, 187B.

To all whom it may concern:

Beit known that I, JOHN W. McGrLL, of New York city, in the county of New York and State of New York, have invented, a cer- 7. tain new. and useful Attachment to Pencili Gases and Pen-Holders', for opening envelopes, `erasing ink-marks, and for other purposes, of which the following is a specification:

vselope-opener, eraser, Ste.

The tool or implement for opening envellres, erasing, Svc., consists of a pointed steel ide with a knife edge or edges concaved on e side, so that it will iitclosely to a cylin- "cal pencil-case or penholderprojectingfrom .bcket or barrel, with an open slot from end ,end on the side opposite to the blade, said rrel or socket being of suitable size to slip ito an ordinary pencil-case or pen-holder, .nd to slide back and forth thereon, and to be feld bythe elasticity of said open socket in ny position in which it may be placed thereon with sucient rmness to enable it to be usedfor any of the purposes for which it is designed. In the accompanying drawing, Figure l is a view of the concave side of the blade, and of the socket from which it projects. Fig. 2 is a view of the reverse side of the same. Fig. 3 is a view of the same attached to a pencilpoint protector and slid back in position for carrying in the pocket. Fig. 4 is a view of the same slid forward in position for use as an envelope-opener or eraser. Fig. 6 is a view of the same with a device for preventing the socket carrying the knife-blade from slipping oft' from the pencil or pen-holder. Fig. 5 is a view of the implement in use as an envelope-opener, and Fig. 7 is a view of the same applied to an ordinary wooden pencilcase or pen-holder.

A is the blade, and A the open elastic socket which slips onto the pencil or penholder B. The elasticity of this open socket adapts it to be applied to pencils or pen-holders of varying sizes. f- The blade A, with its socket, is made of the best sheet-steel, and the edges of said blade are so sharpened as to adapt it for erasing' ink-marks or opening envelopes. Said blade is also well adapted to clean the finger-nails, and there may be cut or impressed upon one side of the barrel A' a rasping-surface for filing the nails, as shown at c in Fig. 2.

Figs. 3, 4, and 6 show my erasing and envelope-opening blade applied to a pencil-point protector, with a rubber eraser-plug, b, in the end thereof.

Fig. 6 shows the end of the metal cylinder in which the plug b is inserted serrated, and one of the teeth b' bent outward, to serve as a stop to prevent the socket A from sliding o.

When the socket A is slid back, as shown in Fig. 3, the blade A fits close to the cylinder B and is entirely out of the way 5 but when slid forward to any desired position upon said cylinder the elasticity of said open socket will cause it to clasp said cylinder with sufficient firmness for use.

WVhat I claim as my invention, and desire to secure by Letters Patent, is-

The straight, narrow, concave, and pointed' Itis hereby certified that in the concluding clause of the Letters Patent propel', herein contained, the signing and sealing is stated, through error of' the Patent Oftce, to be in the of our Lord one thousand eight hundred and seventy-eighth.

l i year of' our Lord one thousand eight hundred and seventy-ninth. It should be in the year il t' January 11, 1879, date of certificate of correction.

y I I Correction in Letters Patent No. 209,411. 

